Alright, that worked... The programs fixed. THanks
Computer Science Canada jcreator |
| Author: | RyanHB [ Tue Oct 20, 2009 8:11 am ] |
| Post subject: | jcreator |
This is the client class. Below the client class I have placed the actual class which is called upon..mutators etc.. I am getting this error message: Exception in thread "main" java.lang.NullPointerException at Face.<init>(Face.java:19) at Face.<init>(Face.java:27) at SmileTest.main(SmileTest.java:29) --------------------------------------------------------- import TerminalIO.*; import TurtleGraphics.*; import java.awt.Color; import javax.swing.JColorChooser; public class SmileTest { public static void main(String[] args) { KeyboardReader reader= new KeyboardReader(); double x,y, radius; int mood=0; //Reds in the Initial x & y Positions x= reader.readDouble("Initial x position: "); y= reader.readDouble ("Initial y position: "); //Size of the FACE radius = reader.readDouble("Set the size of the face: "); mood= reader.readInt("1= Happy, 2= Sad: " ); // JCreator Colour pad JColorChooser jcc= new JColorChooser(); Color c = jcc.showDialog (null, "Pick a colour for the face: ", Color.blue ); // Create the Basic Face Face smile = new Face(x , y); smile.setRadius(radius); if (mood==2) smile.setMood(false); else smile.setMood(true); smile.setColor(c); reader.pause(); smile.draw(); while (true){ x=reader.readDouble("New x position: "); y=reader.readDouble ("New y position:" ); radius= reader.readDouble("set the size of the face: " ); mood=reader.readInt("1= Happy, 2= Sad: " ); c=jcc.showDialog(null, "Pick a new colour for the face", Color.blue); smile.erase(); smile.setColor(c); smile.setRadius(radius); if (mood==2) smile.setMood(false); else smile.setMood(true); smile.move(x,y); smile.draw(); } } } ------------------------- Class with mutators etc.. import TurtleGraphics.*; import java.awt.Color; public class Face { private StandardPen pen; private double xPosition, yPosition ; private boolean mood; private double radius; private Color colour; public Face() { xPosition = 0; yPosition = 0; radius= 0; mood= true; pen.setColor(Color.red); pen = new StandardPen(); } public Face (double x, double y){ this(); xPosition=x; yPosition=y; } public void draw(){ //Draw the outline of the face drawCircle(xPosition, yPosition, radius); //Draw the left, then the right, eye. drawCircle(xPosition - radius /2.5, yPosition +radius /3, radius /4); drawCircle(xPosition + radius /2.5, yPosition +radius /3, radius /4); //Draw the horizontal part of the mouth drawLine(xPosition - radius/3, yPosition - radius/2, xPosition + radius/3, yPosition - radius/2); if (mood==false){ //Draw the left smile line drawLine(xPosition - radius /3, yPosition - radius/2,xPosition - radius /3 - 5, yPosition - radius/2+5); //Draw the right smile line drawLine(xPosition + radius /3, yPosition-radius/2,xPosition + radius /3 +5, yPosition-radius/2+5); }else{ //Draw the left frown line drawLine(xPosition - radius /3, yPosition - radius/2,xPosition - radius /3 - 5, yPosition - radius/2-5); //Draw the right frown line drawLine(xPosition + radius /3, yPosition-radius/2,xPosition + radius /3 +5, yPosition-radius/2-5); } } public void erase (){ //Sets the colour to white pen.setColor(Color.white); //Draws so that it covers the old drawing draw(); //Returns the new colour (white) to the old colour (whatever it was) pen.setColor(colour); } public void move(double x, double y){ xPosition=x; yPosition=y; } private void drawCircle (double x, double y, double r){ //Draws the face double side= 2.0* Math.PI * r/120.0; pen.setColor(colour); pen.up(); pen.move(x+r, y - side/ 2.0); pen.setDirection (90); pen.down(); for(int i= 0; i<120; i++){ pen.move(side); pen.turn(3); } } public void drawLine (double x1, double y1, double x2, double y2){ pen.up(); pen.move(x1,y1); pen.down(); pen.move(x2,y2); } public void setMood (boolean md){ mood=md; } public void setRadius (double rd){ //Sets the radius of the circle radius=rd; } public void setColor (Color cl){ colour = cl; pen.setColor(colour); } } thanks, |
|
| Author: | DemonWasp [ Tue Oct 20, 2009 8:36 am ] |
| Post subject: | RE:jcreator |
The Face ( double x, double y ) constructor is calling the Face () constructor, which is accessing the pen variable before it's initialized. Put the initialization ( the "pen = new StandardPen()" line ) before the access to set its colour. This is a relatively simple problem. Read the error it gives you, it shows the line numbers you need to look at and tells you more-or-less what the problem is. |
|
| Author: | RyanHB [ Thu Oct 22, 2009 10:25 am ] |
| Post subject: | RE:jcreator |
Alright, that worked... The programs fixed. THanks |
|